package com.goofengcn.website.application.util;

/**
 * Created by IntelliJ IDEA.
 * User: DROOPY
 * Date: 2009-4-3
 * Time: 15:33:39
 * To change this template use File | Settings | File Templates.
 */
import java.io.IOException;
import java.util.Collection;
import java.util.Date;
import java.util.Calendar;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * Struts2 Utils类.
 *
 * 实现获取Request/Response/Session与绕过jsp/freemaker直接输出文本的简化函数.
 * 
 * @author calvin
 */
public class SpringUtils {

	//header 常量定义
	private static final String ENCODING_PREFIX = "encoding:";
	private static final String NOCACHE_PREFIX = "no-cache:";
	private static final String ENCODING_DEFAULT = "UTF-8";
	private static final boolean NOCACHE_DEFAULT = true;

    //-- content-type 常量定义 --//
	private static final String TEXT_TYPE = "text/plain";
	private static final String JSON_TYPE = "application/json";
	private static final String XML_TYPE = "text/xml";
	private static final String HTML_TYPE = "text/html";
	private static final String JS_TYPE = "text/javascript";

	private static Logger logger = LoggerFactory.getLogger(SpringUtils.class);

	private SpringUtils() {
	}

    /**
     * 起始时间（00:00:00.000）
     *
     * @param d
     * @return
     */
    public static Date getBeginDate(Date d) {
        if (d == null)
            return null;
        
        Calendar c = Calendar.getInstance();
        c.setTime(d);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        return c.getTime();
    }

    /**
     * 结束时间（23:59:59.999）
     *
     * @param d
     * @return
     */
    public static Date getEndDate(Date d) {
        if (d == null)
            return null;

        Calendar c = Calendar.getInstance();
        c.setTime(d);
        c.set(Calendar.HOUR_OF_DAY, 23);
        c.set(Calendar.MINUTE, 59);
        c.set(Calendar.SECOND, 59);
        c.set(Calendar.MILLISECOND, 999);
        return c.getTime();
    }

	// 取得Request/Response/Session的简化函数 //

	/**
	 * 取得HttpSession的简化方法.
	 */
//	public static HttpSession getSession() {
//		return ServletActionContext.getRequest().getSession();
//	}
//
//	/**
//	 * 取得HttpRequest的简化方法.
//	 */
//	public static HttpServletRequest getRequest() {
//		return ServletActionContext.getRequest();
//	}
//
//	/**
//	 * 取得HttpResponse的简化方法.
//	 */
//	public static HttpServletResponse getResponse() {
//		return ServletActionContext.getResponse();
//	}

	// 绕过jsp/freemaker直接输出文本的函数 //

	/**
	 * 直接输出内容的简便函数.

	 * eg.
	 * render("text/plain", "hello", "encoding:GBK");
	 * render("text/plain", "hello", "no-cache:false");
	 * render("text/plain", "hello", "encoding:GBK", "no-cache:false");
	 *
	 * @param headers 可变的header数组，目前接受的值为"encoding:"或"no-cache:",见示例代码.
	 *                不设置时默认值分别为UTF-8和true.
	 */
	public static void render(HttpServletResponse response ,final String contentType, final String content, final String... headers) {
		try {
			//分析headers参数
			String encoding = ENCODING_DEFAULT;
			boolean noCache = NOCACHE_DEFAULT;
			for (String header : headers) {
				String headerName = StringUtils.substringBefore(header, ":");
				String headerValue = StringUtils.substringAfter(header, ":");

				if (StringUtils.equalsIgnoreCase(headerName, ENCODING_PREFIX)) {
					encoding = headerValue;
				} else if (StringUtils.equalsIgnoreCase(headerName, NOCACHE_PREFIX)) {
					noCache = Boolean.parseBoolean(headerValue);
				} else
					throw new IllegalArgumentException(headerName + "不是一个合法的header类型");
			}

			//HttpServletResponse response = ServletActionContext.getResponse();

			//设置headers参数
			String fullContentType = contentType + ";charset=" + encoding;
			response.setContentType(fullContentType);
			if (noCache) {
				response.setHeader("Pragma", "No-cache");
				response.setHeader("Cache-Control", "no-cache");
				response.setDateHeader("Expires", 0);
			}

			response.getWriter().write(content);

		} catch (IOException e) {
			logger.error(e.getMessage(), e);
		}
	}

}
